Lining for casings of rotary pumps.



PATENTED MAY 26,1908.

A. W. JONES. LINING FOR GASINGSOI ROTARY PUMPS.

APPLIOATIOK FILED JUNE 28. 1906.

' i/vibwoozo ADAM W. JONES, OF ATLANTA, GEORGIA.

LINING FOR CASINGS OF ROTARY PUMPS.

Specification of Letters Patent.

fatented May 26, 1908.

Application a June 2a, 1906. serial. 110,323,871.

- exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

us invention relates to rotary pumps, and

more particularly to linings for the oasin thereof. Such pumps are used largely in mining phosphate as it occurs in certain formations; and in this application it has been found that the rock very soon ears the casing in such a way as to render the pump useless. To meet this condition, it has been proposed to provide the casing with metal linings, which, through their hardness or by reason of the fact that they were replaceable, were to save the casing from the effects of erosion. Some of these linings were made of manganese steel, because of the superior hardness of this alloy; but experience has shown that the life of metal linings, whatever their composition, is of but a few months duration, at the end of which time a new lining must be inserted or the pump discarded. This constitutes a difiiculty, the gravity of which cannot be too strongly emphasized, not so much because of the actual cost involved, but on account of the fact that the re airingor re lacingof a pump not infrequent y reduces tie capacity of the plant by one pump for as much as a day. When it is remembered that this occurrence is repeated every few months and that each pump normally handles a large amount of phoshate rock daily, it will be realized that the lbss brought about in this way is a serious factor to be reckoned with. Then when it is remembered that all efforts heretofore to prolong the continuous running of the pumps have been successful only to the extent ofa few months, at most, it willbe further realized that there is a very imperative demand for a casing lining capable of resisting wear for a considerable period.

Hitherto, it has been presumed that the lining, in order to have resisting qualities, must be made of metal, and all the linings proposed or put. in practice have been of metal, the general object being to render the lining as hard and unyielding as possible; Now I find that the theory that the lining should be metallic is an error, and on the" contrary have made the unlooked for discovery that a lining constructed of resilient material, particularly rubber, possesses thelong-desired lasting qualities. It has been demonstrated that rubber, when subjected to the same conditions that produce rapid erosion of the metal linings, lasts many times as long as would the metalunder these conditions. This apparently paradoxical condition I attribute to the fact that the rubber, or other resilient material, yields to the impact of the fragments of rock or articles of sand, thus escaping injury, w ereas the metal lining, being incapable of yielding at each point of impact, suffers abrasion. The abrasion produced on a manganese steel lining by any one particle of rock may be extremely slight, a pare'ntly negligible, but the aggregate of a rasion, due to the vast amount of rock passing through the pump, is such as to Wear out even this hard metal in a few months. I wish to emphasize, therefore, that I believe myself to be the first to propose the use of a non-metallic lining for rotary pump casings, -and consider this as constituting one of the broad phases of my invention. Hitherto, also, great difficulty has been experienced in securing metal linin s in place, so that the water and rock partic es would not get behind, in this way wearing out the casing itself and renderingfhe latter, as well as the lining, useless.

ther features of my invention comprehend certain improved methods of securing a lining in a casing of a pump of the class described, the object being to prevent passage of material between the casing and lining. As will become apparent, these methods of attachment might be applied with advantage to linings made of metal, if for any pur pose, as it might well be, a metal lining should be more desirable than a non-metallic, resilient one.

A subsidiary feature of the invention relates to the manner in which the lining may be made to serve also as a gasket interposed between sections of the casing.

In the drawings: Figure 1 is a vertical, longitut'linal section through a rotary )unip casing, showing one of my non-metallic, resilient linings in place; Fig. 2 is a vertical, transverse section of the same; Fig. 3 is a pcrspective view of the form of lining shown in these figures Fig. 4 is a section across the annular rim of the casing and lining shown in the preceding views; Fig. 5 is a similar section through the lining only; Fig. 6 is a section similar to Fig. 4, illustrating a slightly ditferent form of lining; Fig. 7 is a view like Fig. 5, showing the same form of lining illustrated in the last View; Fig. 8 is another view like Fig. 4, there being shown a different form of casing and lining from those hitherto illustrated; and Fig. 9 is a view of the nature of Fig. 5, exhibiting the lining of the last figure.

Referring now to these figures, and for the present more particularly to Figs. 1 to 5, it bein understood that the several views certain concrete embodiments of the underlying principle of the invention:,A is the casing of a rotary pum adapted to contain any usual or prererrer form of rotor (not shown). This casing is constructed in sections, comprising the side plates (1, and the two annular rim sections b,b. Substantially tangential, half-cylindrical projections c, 0 form the outlet of the casing, as will be readily understood, this however constituting no part of my invention. Each side plate a is conveniently provided with an outstanding cylindrical flange (Z, the rim of this flange being turned at substantially right angles outward from the center, or parallel to the side plates and spaced slightly therefrom. The inner edges of the annular sections 5, b are supported'by the cylindrical portions of the flanges (1, and the annular rim sections and the side plates are very suitably connected by means of bolts k pussin through the outturned edges of the flanges (Z and taking into the sections 1). Peripheral flanges e, e are also formed on the rim sections, and these may be connected by means of bolts B indicates one form of the non-metal ic lining forming the substance of my invention. As shown in these views, its trough portion may be formed in any shape to conform to the rim of the casing, a curved tor -1 being shown but it being obvious that the. lining might be angular in cross-section, or made in any shape to fit the form of easing preferred. The attaching means shown in the views under discussion as constituting a peripheral flange g, which is interposed between the flanges e and through which pass the boltsf, and side flanges l1, corresponding to the flanges (Z, being interposed between the inner edges of the rim sections and the flanges d and also between these flanges and the sides of the rim sections, thus receiving the securing bolts 76. By this construction, it will be seen, the lining is securely held to the casing at theto and bottom of the trough, and in this way It is rendered impossible [or material to penetrate between the casing and lining.

in Figs. 6 and T is shown a form of lining Another of the forms in which it has oc curred to me to'manufacture the lining is illustrated in Figs. 8 and 9 and designated by the reference letter B As will be read- .ily recognized, this shape of lining is applicable to casings having a rim region constituted of one integral piece, and is, therefore, not provided with the peripheral flange g of the other two constructions. The rim sec-- tion of the casing has been designated in these last two views as If, it being understood that the side plates may be of the same construction already described.

It will be immediately apparent from the views that, in general, a desirable way of forming the lining is as a trough open around its inner periphery and extending over the sides of the casing so as slightly to overlap the periphery of the rotor as indicated by dotted lines in Fig. 1. As clearly shown in Fig. 3, the trough is intended to be provided with a tubular extension m, fitting the outlet of the casing, continued along this region. In the form of my invention illustrated in Figs. l-5 the lining serves as a gasket between the side plates and the annular rim sections and also between the rim sections themselves. The other forms of linings possess this same feature in part. It will be noted that where the lining flanges are interposed between the casing sections, these sections do not contact with each other, the whole compression exerted by the securing bolts being thus borne by the lining flanges, thus constituting the latter efficient packing members.

As emphasized at the beginning of the specification, the essence of the invention resides in the material of which the lining is composed, this constituting the radical departure from the prior art. This material is primarily non-metallic. More specifically it is resilient, and preferably it is rubber.

The rubber may be pure or it may consist of a duck backing faced with rubber, or of other combination of rubber'and textile. Instead of rubber, leather, or in fact any other non-metallic, resilient material might be employed without departing from the spirit of my invention. In Fig. 5 the lining is indicated as being composed of textile next the metal shell and a rubber facing on the inside. It is to be understood that and the flanges g may be where in the claims I refer to a rubber lining I do not limit myself to a lining entirely'of rubber.

It may be noted that I may avail myself of cement in attaching the lining to the easing. Such cement Wlll be of advantage in causing every portion of the lining to lie close to the surface of the shell, and will be particularly advantageous in connection with such a form of lining as is illustrated in Figs. 6 and 7. However, cement might be omitted even with this form of lining. I de-' sire it to be understood that I regard it as ossible that the resilient lining might be field in place entirely by cement, the attaching flanges being dispensed with entirely. All these and other-modes of attachment I regard as being applicable to the fundamental idea of a non-metallic, resilient lining.

What is claimed as new is:

1. The combination with the casing of a rotary pump, of a lining therefor formed of resilient material.

2. The combination with the casing of a rotary pump, of a lining therefor composed of rubber.

3. The combination with a rotary-pump casing, of a surface linin of yielding material positioned, relative to t e inner face of the periphery thereof, to receive directly thereagainst the effect of material passing through the pump.

4. The combination with the casing of a rotary pump, of a removable lining therein formed of resilient material.

5. The combination with the casing of a rotary pump, of a lining of rubber covering the inner face of the periphery thereof.

6. The combination with the casing of a rotary pump, of ,a lining of resilient material countersunk in the inner face of the periphery thereof.

7. The combination with the casing of a rotary pump, of a linin of resilient material covering the inner sur ace of the peri hery thereof and extending part over the si es.

8. The combination with a rotary ump casing formed in sections, of a yielding ining therefor having a flange interposed between the sections.

9. The combination with a rotary pump casing formed in sections, of a lining of resilient material serving as a gasket between said sections.

10. The combination with a rotary pump casing comprising sections having a plurality of junctions, of a lining of resilient material having flanges interposed between the casing sections at the several junctions.

11. The combinationwith a rotary ump casin of a trough shaped, yielding fining there or having attaching means at the top and bottom of the trough.

12. The combination with a rotary pump casing com rising sections, of a troughshaped, yie ding lining havin attaching flanges at the top and bottom 0 the trough received between the casin sections,

13. The combination wit a pump-casing having two distinct annular rim regions provided with peripheral flanges, of a troughshap'ed, yielding lining-having a peripheral flange inter osed between the casing flanges, and means or com ressing the casirp; flanges against the lining ange, whereby the latter serves as a gasket.

14. The combination with a-pum casing. having a peripheral portion and si e pieces havin L-shaped flanges adapted to receive the ei lges of the peripheral portion, of a yielding lining having L-shaped marginal flanges received between the peripheral portion of the casing and the flang'es of the side pieces, and means for forcin the peripheral region and the side-piece an es laterally against the lining flanges, Where y the latter serve as gaskets.

15. The combination with a pump casing having two side pieces and two rim sections, the latter being rovided on their inner edges with L-shaped anges receiving the edges of the side pieces and on their outer edges with peripheral flanges, of an annular, troughsha ed, yielding lining having side flanges of I L-s ape and a single peripheral flange, and means for securing the casing sections together and the lining flanges between the sections.

In testimony whereof, I afiiX my signature,

in the presence oftwo subscribing witnesses. 100

ADAM W. JONES. Witnesses:

EMORY H. BOGLEY, EDMUND H. PARRY. 

